I would rather it be based on some things that are more pratical as in life like traits and looks, heavy, thin, blue eyes, brown eyes etc. However, I don't think we will see an attraction system in this game because we are supposed to use all those crystals and mood booster decor to make Sims get into a romantic mood. Then they are attracted to anyone. Doesn't matter who.
Eyes can't be changed so that one might be a good choice. (The game won't change the eye color) but moods could overlap traits such as confident buff, so anyone walking around feeling confident would have that walk, even if temporarily, then the romance would be over as soon as that moodlet disappeared.
They would have to come up with something more than traits because buffs overlap with those, and I don't think they would ever include skin color, and it would be wild if it was based on clothes since the townies pick some doozies. But sure, people are attracted to clothes such as uniforms and are attracted to people who wear or don't wear makeup. Things like good cook might make Sims attracted to anyone since these Sims gain too many cooking skills and too fast. So, not sure they should use skills as a choice, either. By the time a Sim has mastered their career (some of them) they have a boat load of skills so everyone in town would be attracted to them one way or another.
So, I doubt we see an attraction system and the crystals and mood decor is probably all we see and some in this thread are right, after four years and families and couples already established I doubt they try it. But they can prove me wrong if they want to release it. :p
